Select channel from multiplexer to show temperature values in c programming

I have question regarding selecting channel from multiplexer. I'm trying to receive some temperature reading from the two sensors which shared the same address and while I'm using one sensor, it can work perfectly. However, when I tried to fix the second sensor onto the circuit and edit the program abit, it doesn't work. Can someone assist me?

here's the code when it starts to read:

void readSensor(void) {
int ch;
TWI_init_master();
for (ch=0; ch<2; ch++) 
{
TWI_start();
TWI_write_address(0xE0); // set multiplixer
TWI_write_data(0); // disable all ch    
    TWI_write_data(ch+1); // enable  ch-ch+1
    TWI_stop();
    delay100us(1);
    TWI_start();
    TWI_write_address(0x14);// writing to sensor
    TWI_write_data(0x4C);// asking for data
    delay100us(1);
    TWI_repeated_start();// restart
    TWI_read_address(0x15);// read

    if (ch==0)
    {
        for(i = 0; i < 34; i++) {
        TWI_read_data();//geting data
        readbuff[i] = recv_data;
        }

        if(!(D6T_checkPEC(readbuff, 34))) {
            writeChar(0x50, USB);
            writeChar(0x50, USB);
            writeChar(0x50, USB);
        }
        else
        {
            for(i = 2; i < 34; i++) 
            {
                temp = readbuff[i];
                writeChar(temp, USB);
                delay100us(1);
            }                       
        }
    }
    else if (ch==1) 
    {

        for(i = 0; i < 34; i++) {
            TWI_read_data();//geting data
            readbuff2[i] = recv_data;
        }
        if(!(D6T_checkPEC(readbuff2, 34))) {
            writeChar(0x50, USB);
            writeChar(0x50, USB);
            writeChar(0x50, USB);
        }
        else
        {
            for(i = 2; i < 34; i++) 
            {
                temp = readbuff2[i]; //readbuff 2 is defined for sensor 2, its just another array    
                writeChar(temp, USB); // Send data to the real term
                delay100us(1);
            //  delay10ms(10);  
            }
        }
    }
    TWI_stop();
    delay100us(10);
//  delay10ms(10);  
//TWI_repeated_start();// restart
//TWI_stop();   
}
//TWI_stop(); }

Thanks!